Attachment for elevators



(No Model.)

R. SUTHERLAND.

ATTAGHMBNT PoR BLEVATORS.

No. 489,240. Patented Jan. 3, 1893.

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UNITE STATES PATENT OFFICE.

ROBERT SUTHERLAND, OF BOSTON, MASSACHUSETTS.

ATTACHMENT FOR ELEVATORS.

SPECIFICATION forming part Of Letters Patent No. 489,240, dated January 3, 1893.

Application filed September 15, 1891. Serial No. 405,774. (No model.)

To @ZZ whom it may concern,.-

Be it known that I, ROBERT SUTHERLAND, a citizen ofthe United States of America, and a resident of the city of Boston, in the county of Suffolk and State of Massachusetts, have invented a certain new and useful improved Attachment for Elevator Carriages, Platforms, &c., of which the following is a full, clear, and exact description.

This invention relates to an attachment in one part applied to an elevator platform or carriage and in another part applied to a sliding self-closing door at a landing of the elevater-well whereby with the platform at a iioor landing of the building on then Opening the door, said two parts of the attachment will engage and hold the door opened and on a determined length of movement, either up or down, will disengage and leave the door free to close, all as hereinafter particularly described and pointed out in the claim.

In the drawings, forming part of this specification, Figure l is a perspective view of an elevator-carriage and its well and a floorlanding severally broken away and a selfclosing door and the attachment of this invention On said door and said carriage. Fig. 2 is a horizontal section in detail and enlarged, line 2 2, Fig. l. Fig. 3 is a vertical section in detail and enlarged, line 3 3, Fig. l.

In the drawings, A is an elevator-carriage; B is the elevator-well; Gis a Hoor landing and D is a sliding self-closing door for said landing all as Well known and forming nO part of this invention.

Theipart of the attachment of this invention which is on the door D consists of a vertical plate E attached to the forward edge D2 and projected beyond the inner sideD3 of the door and also beyond the floor landing and toward but not into the pathway of the elevater carriage. This plate E has On its Opposite sides and off from the inner side Of the door, and beyond the floor landing vertical abutment faces E2 and E3, each for action as hereinafter explained.

The part E of the attachment Of this invention which is on the elevator, consists of a horizontal headed-bolt E contained in a tubular casing Fzand its inner end is backed by a spring E3 confined end to end between the iuner end of the bolt and the farther end of the casing. This bolt is free to slide forward and backward in its casing and islimited, in either direction, by a cO-Operative action, of a transverse pin d fixed On the casing and a longitudinal slot b Of the bolt which receives said pin. The tubular casing F2 is fastened On the elevator-platform at right angles to and with the head F4 of its bolt toward the sliding-door and in position when the door is fully opened to then lie, by its vertical flat side F5, against the abutment face E2 of the plate E on door and so hold the door opened until by the movement of the elevator, either up Or down, said bolt traveling over the height of the plate escapes at either its upper or lower end therefrom, when the door is left free to close. The side F6 opposite to the fiat side I `5Of the bolt is beveled off lengthwise of the bolt so thatin opening the door the abutment face E3 Of its plate E can the better work on and force the bolt inward for the door to pass.

Having thus described my invention, what I claim and desire to secure by Letters Pat- -entis:

The combination with an up and down moving elevator-platform, and a vertical, but horizontallysliding'door at the floor-landingfor the elevator, Of a horizontally extended projection E which is secured to andis projected from said door beyond the Hoor-landing and toward, but not into the vertical pathway of said platform and presents exposed vertical abutment faces E2, E3 transversely to and Oif from the inner side of said sliding door, and beyond the oorlanding, and a horizontal sliding spring-bolt F which is mounted on and normally projects from said platform into the vertical plane of said door-projection E and has a beveled head F4 to act in cti-operation with said abutment faces of said door projection, all as described, for the purposes specilied.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ROBERT SUTHERLAND.

Witnesses:

ALBERT W. BROWN, MARION E. BROWN. 

